Relating to ammonia.
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am·mo·ni·a·cal .am-ə-'nī-ə-kəl also am·mo·ni·ac ə-'mō-nē-.ak adj of, relating to, containing, or having the properties of ammonia
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am·mo·ni·a·cal (am″o-niґə-kəl) containing ammonia or treated with excess ammonia.Medical dictionary. 2011.